On 4/26/2022 7:56 PM, Bruce Kellett wrote:

On Wed, Apr 27, 2022 at 12:32 PM Brent Meeker <meekerbr...@gmail.com>wrote:On 4/26/2022 7:01 PM, Bruce Kellett wrote:On Wed, Apr 27, 2022 at 11:35 AM smitra <smi...@zonnet.nl> wrote: You just presented an elaborate presentation involving N branching steps and counted all 2^N branches as equal. That's branch counting and it's known to not be compatible with QM. The MWI can be taken to be QM without collapse and this is known to be a consistent theory It would seem that you are claiming that QM without collapse is not based on Everett's ideas. If you claim that such a theory exists and is consistent, then you really should present that theory, and point out that it has nothing to do with Everett, or with obtaining every outcome of a trial on different branches. My impression is that you do not have any worked-out theory -- you just throw arbitrary objections to my working through the consequences of Everett's approach to quantum mechanics. I have shown that many problems exist with Everettian QM. If you agree, and are prepared, with me, to throw out Everett, then we agree, and there is nothing more to be argued about (at least, until you present some different complete theory).I think Everett's idea was just to get rid of wave-function collapse and instead assert that the apparently incompatible results of an experiment were just different entanglements of one's brain/instrument with different superposed components of the state of the system measured. This is all consistent with the Copenhagen interpretation, except in CI all but one of the orthogonal components is discarded. Decoherence has cast some light on why the components quickly become orthogonal and why they become orthogonal only in certain bases.An important component of Everett's idea was that quantum evolutionwas unitary. That gave centrality to the Schrodinger equation. If onewants to persist with unitary evolution, one cannot avoid theSchrodinger equation. This has a number of consequences for thetheory. One is that the theory is deterministic -- there are noprobabilities, and all outcomes of an experiment are, in some realsense, equivalent. That leads to the consequences that I have pointedout. If Saibal wants to avoid those consequences, then he has toabandon the idea of unitary evolution and the Schrodinger equation. Ithink Saibal would be reluctant to go down that path, so he is leftwith an inconsistent mess.

`I don't see that it's inconsistent. It's just like QBism. You get a`

`result and you renormalize the wf. Whether the other outcomes occur in`

`some platonic world, is irrelevant.`

Brent

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